Answer:
We start with 0 + 40.
1. 0 + 40
2. 1 + 39
3. 2 + 38
4. 3 + 37
.....
keep going....
.....
19. 18 + 22
20. 19 + 21
21. 20 + 20
There are 21 pairs of whole numbers that have a sum of 40.
Step-by-step explanation:
hope this helps :)
Answer:
Step-by-step explanation:
f(x) = 2x² + 14x - 4
= 2(x² + 7x) - 4
= 2(x² +7x + 3.5²) - 2(3.5²) - 4
= 2(x+3.5)² - 28.5
vertex (3.5, -28.5) = (7/2, -57/2)
The vertical intercept is the y-intercept, i.e., f(0) = -4.
The x-intercepts are the values of x for which y=0.
2x² + 14x - 4 = 0
x = [-14±√(14²-4(2)(-4))]/[2(2)] = [-7±√57]/2 ≅ -7.27, 0.27
Answer:
20
Step-by-step explanation:
4 * (2a − 1)
Let a=3
4 * (2*3 − 1)
Simplify inside the parentheses first
4 * (6 − 1)
4 * (5)
20
Since the sweater is now 30% off, that means it is selling for 70% of it's original price ( 100% - 30% = 70%).
Multiply the original price by 70%:
52 x 0.70 = 36.40
The sale price is $36.40
